<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    @keyframes rotate {
      to {
        transform: rotate(1turn)
      }
    }
    #loading{
    width: 30px;
    height: 30px;
    border: 5px solid #D9D7D9;
    border-left-color: blue;
    border-top-color: blue;
    border-radius: 50%;
    animation: rotate 1000ms infinite linear;
    }
</style>
<body>
    <div class="loading">
        <div id="loading"></div>
    </div>
</body>
</html>